Multi-domain application environments where distributed domains interoperate with each other are becoming a reality in internet-based and web-services based enterprise applications. The secure interoperation in a multidomain environment is a challenging problem. In this paper, we propose a distributed secure interoperability protocol that ensures secure interoperation of the multiple collaborating domains without compromising the security of collaborating domains. We introduce the idea of access paths and access paths constraints. Furthermore, we device a path discovery algorithm that is capable of querying interoperating domains for the set of secure access paths between different domains.
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